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40-669: The Mooney Mooney Bridge , officially the Mooney Mooney Creek Bridge , and popularly known as The NSW Big Dipper Bridge , is a twin cantilever bridge that carries the Pacific Motorway (M1) across Mooney Mooney Creek , located near Mooney Mooney in the Brisbane Water National Park on the Central Coast of New South Wales , Australia. The concrete box girder bridge was opened on 14 December 1986 by

80-423: A balanced cantilever ; when they attach to a solid foundation, the counterbalancing arms are called anchor arms . Thus, in a bridge built on two foundation piers, there are four cantilever arms: two which span the obstacle, and two anchor arms that extend away from the obstacle. Because of the need for more strength at the balanced cantilever's supports, the bridge superstructure often takes the form of towers above

120-618: A 60-metre (200 ft) high bungee jump over the North Sea waves. The present pier is a successor of an earlier pier, which was completed in 1901 but in 1943 destroyed by the German occupation forces. The first recorded pier in England was Ryde Pier , opened in 1814 on the Isle of Wight , as a landing stage to allow ferries to and from the mainland to berth. It is still used for this purpose today. It also had

160-496: A bridge that could handle differential settlement of the foundations. Engineers could more easily calculate the forces and stresses with a hinge in the girder. Heinrich Gerber was one of the engineers to obtain a patent for a hinged girder (1866) and is recognized as the first to build one. The Hassfurt Bridge over the Main river in Germany with a central span of 124 feet (38 metres)

200-623: A leisure function in the past, with the pier head once containing a pavilion, and there are still refreshment facilities today. The oldest cast iron pier in the world is Town Pier, Gravesend , in Kent , which opened in 1834. However, it is not recognised by the National Piers Society as being a seaside pier. Following the building of the world's first seaside pier at Ryde, the pier became fashionable at seaside resorts in England and Wales during

240-647: A linear littoral quayside, and such piers are usually much shorter. Typically each pier would carry a single transit shed the length of the pier, with ships berthing bow or stern in to the shore. Some major ports consisted of large numbers of such piers lining the foreshore, classic examples being the Hudson River frontage of New York , or the Embarcadero in San Francisco . The advent of container shipping , with its need for large container handling spaces adjacent to

280-697: A new high-speed freeway-style traffic link between Wahroonga and Beresfield began in 1952, it was not until April 1963 when construction of the first section of the F3 Pacific Freeway started, between the Hawkesbury River and Mount White , completed in December 1965. A second stage from Mount White to Calga was completed in October 1966. South of the Hawkesbury River, the freeway-grade section to Berowra

320-471: A new pier was built in 1933. It remained till the present day, but was partially transformed and modernized in 1999–2004. In Nieuwpoort, Belgium there is a pleasure pier on both sides of the river IJzer . Scheveningen , the coastal resort town of The Hague , boasts the largest pier in the Netherlands , completed in 1961. A crane, built on top of the pier's panorama tower, provides the opportunity to make

360-556: A pier has two decks. Galveston Island Historic Pleasure Pier in Galveston , Texas has a roller coaster, 15 rides, carnival games and souvenir shops. Early pleasure piers were of complete timber construction, as was with Margate which opened in 1824. The first iron and timber built pleasure pier Margate Jetty , opened in 1855. Margate pier was wrecked by a storm in January 1978 and not repaired. The longest iron pleasure pier still remaining

400-451: A pier presents a set of different circumstances to fishing from the shore or beach, as you do not need to cast out into the deeper water. This being the case there are specific fishing rigs that have been created specifically for pier fishing which allow for the direct access to deeper water. In Blankenberge a first pleasure pier was built in 1894. After its destruction in the World War I ,

440-453: A result, a fence was erected along the side of the bridge to prevent people jumping off. This fence was erected in 2003 and cost A$ 1,000,000. Cantilever bridge The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over 1,500 feet (450 m), and can be more easily constructed at difficult crossings by virtue of using little or no falsework . Engineers in

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480-474: A standard in the design of bridges throughout New South Wales. They employ a two rail parapet which optimises views of the landscape. The bridges were designed with the natural surroundings in mind and form a simple uncluttered shape so not to detract from the natural bushland of the national park. The three span haunched girders on the bridge were critical to this as were the multiple piers that provide character and strength. The Mooney Mooney Bridge has been

520-623: Is at Southend-on-Sea , Essex , and extends 1.3 miles (2.1 km) into the Thames Estuary . The longest pier on the West Coast of the US is the Santa Cruz Wharf , with a length of 2,745 feet (837 m). Providing a walkway out to sea, pleasure piers often include amusements and theatres as part of their attractions. Such a pier may be unroofed, closed, or partly open and partly closed. Sometimes

560-720: Is available to support the tension in the upper chord of the span during construction, usually limiting this method to the spanning of narrow canyons. World's longest cantilever bridges (by longest span): Pier A pier is a raised structure that rises above a body of water and usually juts out from its shore , typically supported by piles or pillars , and provides above-water access to offshore areas. Frequent pier uses include fishing , boat docking and access for both passengers and cargo , and oceanside recreation . Bridges, buildings, and walkways may all be supported by architectural piers . Their open structure allows tides and currents to flow relatively unhindered, whereas

600-477: Is the one at Southend. First opened as a wooden pier in 1829, it was reconstructed in iron and completed in 1889. In a 2006 UK poll, the public voted the seaside pier onto the list of icons of England. Many piers are built for the purpose of providing boatless anglers access to fishing grounds that are otherwise inaccessible. Many "Free Piers" are available in larger harbors which differ from private piers. Free Piers are often primarily used for fishing. Fishing from

640-458: The Navajo Bridge ) are built using pure cantilever spans from each side, with neither falsework below nor temporary supporting towers and cables above. These are then joined with a pin, usually after forcing the union point apart, and when jacks are removed and the bridge decking is added the bridge becomes a truss arch bridge . Such unsupported construction is only possible where appropriate rock

680-728: The Prime Minister of Australia , Bob Hawke , and is owned and maintained by Transport for NSW , an agency of the Government of New South Wales . The Pacific Motorway is the main road link between Sydney , the Central Coast and the Hunter Region . The only other road that links all three regions is the Pacific Highway (B83) which from Cowan to Kariong follows a scenic winding route. The Pacific Highway (now known as B83) served as

720-613: The Victorian era , peaking in the 1860s with 22 being built in that decade. A symbol of the typical British seaside holiday, by 1914, more than 100 pleasure piers were located around the UK coast. Regarded as being among the finest Victorian architecture, there are still a significant number of seaside piers of architectural merit still standing, although some have been lost, including Margate , two at Brighton in East Sussex , one at New Brighton in

760-498: The health of sandy beaches and navigation channels . Pleasure piers were first built in Britain during the early 19th century. The earliest structures were Ryde Pier , built in 1813/4, Trinity Chain Pier near Leith, built in 1821, Brighton Chain Pier , built in 1823. and Margate Jetty 1823/24 originally a timber built pier. Only the oldest of these piers still remains. At that time,

800-435: The 19th century understood that a bridge that was continuous across multiple supports would distribute the loads among them. This would result in lower stresses in the girder or truss and meant that longer spans could be built. Several 19th-century engineers patented continuous bridges with hinge points mid-span. The use of a hinge in the multi-span system presented the advantages of a statically determinate system and of

840-466: The Pacific Highway at Doyalson . The 15-kilometre-long (9 mi) section between Calga and Somersby, including the new Mooney Mooney Creek bridge was opened on 14 December 1986, as thousands of people walked across the twin bridges. The freeway carried two lanes heading north and two lanes heading south. Additional developments were made as follows: Mooney Mooney Bridge was designed by Bruce Judd of

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880-415: The action of the outer foundations. Cantilever Bridge.—A structure at least one portion of which acts as an anchorage for sustaining another portion which extends beyond the supporting pier. A simple cantilever span is formed by two cantilever arms extending from opposite sides of an obstacle to be crossed, meeting at the center. In a common variant, the suspended span , the cantilever arms do not meet in

920-423: The center; instead, they support a central truss bridge which rests on the ends of the cantilever arms. The suspended span may be built off-site and lifted into place, or constructed in place using special travelling supports. A common way to construct steel truss and prestressed concrete cantilever spans is to counterbalance each cantilever arm with another cantilever arm projecting the opposite direction, forming

960-582: The fishing and cargo industries and serves as a port for large cruise ships in the area. Many other working piers have been demolished, or remain derelict, but some have been recycled as pleasure piers. The best known example of this is Pier 39 in San Francisco . At Southport and the Tweed River on the Gold Coast in Australia , there are piers that support equipment for a sand bypassing system that maintains

1000-648: The foundation piers. The Commodore Barry Bridge is an example of this type of cantilever bridge. Steel truss cantilevers support loads by tension of the upper members and compression of the lower ones. Commonly, the structure distributes the tension via the anchor arms to the outermost supports, while the compression is carried to the foundations beneath the central towers. Many truss cantilever bridges use pinned joints and are therefore statically determinate with no members carrying mixed loads. Prestressed concrete balanced cantilever bridges are often built using segmental construction . Some steel arch bridges (such as

1040-564: The image of a Victorian cast iron pleasure pier. However, the earliest piers pre-date the Victorian age . Piers can be categorized into different groupings according to the principal purpose. However, there is considerable overlap between these categories. For example, pleasure piers often also allow for the docking of pleasure steamers and other similar craft, while working piers have often been converted to leisure use after being rendered obsolete by advanced developments in cargo-handling technology. Many piers are floating piers, to ensure that

1080-453: The introduction of steamships and railways for the first time permitted mass tourism to dedicated seaside resorts . The large tidal ranges at many such resorts meant that passengers arriving by pleasure steamer could use a pier to disembark safely. Also, for much of the day, the sea was not visible from the shore and the pleasure pier permitted holidaymakers to promenade over and alongside the sea at all times. The world's longest pleasure pier

1120-477: The more solid foundations of a quay or the closely spaced piles of a wharf can act as a breakwater , and are consequently more liable to silting. Piers can range in size and complexity from a simple lightweight wooden structure to major structures extended over 1,600 m (5,200 ft). In American English , a pier may be synonymous with a dock . Piers have been built for several purposes, and because these different purposes have distinct regional variances,

1160-566: The only highway route between Sydney and the Central Coast and the Hunter Region. The original 1930 two-lane steel truss bridge carried the Old Pacific Highway across Mooney Mooney Creek. This bridge remains in concurrent use and is located downstream of the existing Mooney Mooney Bridge. With population and traffic growth, the scenic winding highway route was beset by traffic jams, especially at peak holiday times. Whilst planning for

1200-434: The other side of the bridge. This accident resulted in the death of a woman. On 12 February 2007 another accident occurred when a truck was travelling down the freeway and lost control approaching the bridge, smashing through a guard rail and plunging 30 metres down an embankment at the side of the bridge. The Mooney Mooney Bridge, because of its height, has been susceptible in the past to people committing suicide. As

1240-461: The pier stretching far enough off shore to reach deep water at low tide. Such piers provided an economical alternative to impounded docks where cargo volumes were low, or where specialist bulk cargo was handled, such as at coal piers . The other form of working pier, often called the finger pier, was built at ports with smaller tidal ranges. Here the principal advantage was to give a greater available quay length for ships to berth against compared to

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1280-603: The piers raise and lower with the tide along with the boats tied to them. This prevents a situation where lines become overly taut or loose by rising or lowering tides. An overly taut or loose tie-line can damage boats by pulling them out of the water or allowing them so much leeway that they bang forcefully against the sides of the pier. Working piers were built for the handling of passengers and cargo onto and off ships or (as at Wigan Pier ) canal boats. Working piers themselves fall into two different groups. Longer individual piers are often found at ports with large tidal ranges , with

1320-495: The shipping berths, has made working piers obsolete for the handling of general cargo, although some still survive for the handling of passenger ships or bulk cargos. One example, is in use in Progreso, Yucatán , where a pier extends more than 4 miles into the Gulf of Mexico , making it the longest pier in the world. The Progreso Pier supplies much of the peninsula with transportation for

1360-513: The site of several accidents , resulting in the Pacific Motorway being closed to traffic and causing delays. Some of these accidents have prompted debate on whether a new road should be built to supplement the existing freeway. On 23 October 2004 a semi-trailer 's brakes failed coming down the Freeway and caused a pile-up involving 35 vehicles that had slowed down as a result of a car accident on

1400-431: The structural principles of the suspended span cantilever by sitting in chairs and supporting their colleague, Kaichi Watanabe , in between them, using just their arms and wooden poles. The suspended span, where Watanabe sits, is in the center. The wooden poles resist the compression of the lower chord , while the outstretched arms support the tension of the upper chord. The placement of the brick counterweights demonstrates

1440-510: The term pier tends to have different nuances of meaning in different parts of the world. Thus in North America and Australia , where many ports were, until recently, built on the multiple pier model, the term tends to imply a current or former cargo-handling facility. In contrast, in Europe , where ports more often use basins and river-side quays than piers, the term is principally associated with

1480-567: The then NSW Department of Main Roads and built by Enpro Constructions by the free cantilever method of post tensioned concrete. It consists of twin bridges, each bridge with a main span and two approach spans. The span at the western end of the bridge is 135 metres (443 ft) long, the main span is 220 metres (722 ft) long and the eastern span is 131 metres (430 ft) long. The design has been said to demonstrate how good engineering design and good aesthetics are synonymous, and has been used as

1520-563: Was 275 feet (84 metres) deep and took full advantage of the fact that falsework, or temporary support, is not needed for the main span of a cantilever bridge. The Forth Bridge is a notable example of an early cantilever bridge. This bridge held the record for longest span in the world for twenty-nine years until it was surpassed by the Quebec Bridge . The engineers responsible for the bridge, Sir Benjamin Baker and Sir John Fowler , demonstrated

1560-530: Was completed in 1867 and is recognized as the first modern cantilever bridge. The High Bridge of Kentucky by C. Shaler Smith (1877), the Niagara Cantilever Bridge by Charles Conrad Schneider (1883) and the Poughkeepsie Bridge by John Francis O'Rourke and Pomeroy P. Dickinson (1889) were all important early uses of the cantilever design. The Kentucky River Bridge spanned a gorge that

1600-593: Was completed in December 1968, as a toll road . In October 1973 the Peats Ferry Bridge was duplicated as the Brooklyn Bridge , connecting the Berowra-Hawkesbury River and Hawkesbury River-Calga sections. Concurrently, the freeway was opened from Somersby to Ourimbah and Kangy Angy to Wallarah Creek sections in December 1983, including the single carriageway motorway link from Wallarah Creek to

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